.nav {
    overflow: hidden;
}
.sk {
    position: absolute;
    top: 40px ;
    left: 186px ;
    padding: 3px 0 0 15px;
    border-left: 1px solid #c81523;
}
.sk_list ul li {
    float: left;
    line-height: 45px;
}
.sk_list ul li a  {
    font-size: 16px;
    font-weight: 700;
    color: #000;
    padding: 0 31px;
}
.sk_con ul li {
    line-height: 47px;
    float: left;
}
.sk_con ul li a  {
    font-size: 14px;
    padding: 0 22px;
}
.sk_con ul li:last-child a::after {
    content: '\e91e';
    font-family: 'icomoon';
    font-size: 14px;
}
/* 导航栏结束了 */
/* 列表主体开始了 */
.sk_container .sk_bd ul li {
    overflow: hidden;
    float: left;
    margin-right: 13px;
    width: 290px;
    height: 460px;
    border: 1px solid transparent;
    margin-bottom: 30px;
}
.sk_container .sk_bd ul li:hover {
    border: 1px solid #c81523;
}
.sk_container .sk_bd ul li:nth-child(4n){
    margin-right:0;
}